Welding



sept. 23, 1924. 1,509,384

V. E. WALTER ET AL WELDI NG Filed March 22. 1923 mss mes/7 @wwwPatenledsepti 21",v4 1924,

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Todllwhonttmayconcm: ,Y J Be it known that we, VAmN'rr-Nn E. WAL- 'nlmand WILLIAM lJ. LALLY, citizens of the United States, and residents. res

improvements adapted to the electric welding together of two'- pieces ofdifferent rethrough them.

' "`Fig. 4 is a section sistances or different compositions.

Fig: 1 indicates -diagrammatically th method of welding `a small steeldisc to a comparative] large copper late ;V

Figs. 2 an 3 are respective y verticaland horizontalseetional views ofcertain interposed elements;-

of the inished welded product.

In an application of Phelps, No. 616,108, filed January 31st,'1923,there is described a method of welding -in which a third rt is placedbetween the twoA parts to be Joined, the' assembled parts being thenpressed together while paing a welding 'current In the application ofthis process with a sin le intermediate part it hasbeen found dillcultto make a good weld between pieces which vm'iedconsiderably in totalconduc` Y tivity or resistance dueto'Y diierence in the ance metal suchas cop tinumg it for a very brieggzlated period portant.

size of the pieces Yor their compositions or both; An example of such adillicult'case is Y in the welding of a smallpiece of comparatively highresistance metal such as steel to alarge piece of a comparatively lowresistr. There is a tend-v enc of the steel to m'elt while the copperstilir cool to pmduce a good joint.

vThe current is preferablyvused tin-the iran4 ner described in theMurray Reissue Patent No. 15,466 of October 10, 1922, using a current ofcxtrem'elyhighamp'e're strength or density per unit of area at t e jointand conof time. Under these ci Y nces the difference between'theresistans of the two parts to be joined becomes particularly im- We havefound. that by using aninsert, preferably in reticulated form such' aswire mesh, of'steel, infthe exam' le'above described, uw mesh tends um@d to, the steel disc but not to the copper plate; and' that wnnnme.

when a reticulated insert of copper or brass to the steel.

We have found, however, that by using two Inserts or filling pieces, onead'acent to each work-piece, and particularly y steelmesh next to thesteel work-piece and brass mesh-next to the copper work-piece we securean improved result. Infact by this method we ave been able to make agood strong 'oint The examp e described is illustrated in theaccompanying drawings where 1 and 2 are the opposite electrodes. Acopper plate 3 is tobe welded to a steel disc 4:. Between the two areinserteda steel mesh 5 and a brass mesh 6. Besides the wire'mesh itselfa efflux 7 'is preferably employed occupying the intersticesof the wiremesh.v The parts are subjected to pressure in the manner in-v dicated bythe arrows and the current a'pplied as above described.

It is not essential that the inserts shall be `of identically the samecomposition as the work-pieces to 'which they correspond; Eachworkieee-and its co n insert Should. wever be compose the same metal orof. metals which have aproximately the. same melting int so as to readilweldableto each ot er.

Inst o f using only two' inserts or pieces,'one adjacent to eachwork-piece, we can, if desired, use -a greater number of such of thesame or of varying compositions. 1 l Y 'a Though wehave described 'withgreat particularitfy ments o my improvement, yet it is not to be \understood therefrom that the invention is restricted to the particularembodiments dislarge y"'of i of detail certain specific embodiclosed.Various modifications may be'made at we claim is: 1.A The method ofwelding together two pieces of different resistances which consists 1nplacing atleast two pieces between them, one adjacent to each workfpieceand correspndin in resistance thereto and pieces together.

2. The-amethod of welf'lir'ig' two pieces ofdiielent metals respectively`which 105 vpassinga we ding current and the reticnlated pieces eachcorresponding to the The ymethod of claim 2 applied to a work-piece towhich it is adjacent and pass- 'large cuprous work-piece and a compara,-

ing a 'welding current and pressing the tively small ferrous work-piece.10

pieces together. In witness whereof.,A we have hereunto 5 3. The methodof claim 2 applied to the signed our names.

welding` of a cuprous work-piece to a ferrous VALENTINE E. WALTERwork-place. WILLIAM J. LALLY.

